The first time I took it, I did get a ‘buzz’. There after that went away. Now that I’ve been using it for 2 wks, I have noticed that my general ‘mood’ has improved. I am sharper mentally and my crew at work has noticed this (so it ain’t just in my head). My reaction times don’t seem to have altered, but I am 49 so maybe over the long run it won’t deteriorate as quickly. But how long that run is, I don’t know…